XML 186 R169.htm IDEA: XBRL DOCUMENT
v3.19.1

SUPPLEMENTAL FINANCIAL INFORMATION Company (Condensed Consolidated Statement of Cash Flows) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | $ 1,690 | $ 1,193
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | (2,162) | (1,529)
Purchase of investments subject to significant influence, inclusive of acquisition costs | (49) | (213)
Other investing activities | 21 | (19)
Net cash provided by (used in) investing activities | (2,190) | (1,761)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | 99 | (31)
Proceeds from (Repayments of) Short-term Debt | 129 | 383
Proceeds from Issuance of Long-term Debt | 1,055 | 129
Retirement of long-term debt | (757) | (453)
Proceeds from Long-term Lines of Credit | 321 | 230
Issuance of common and preferred stock, net of issuance costs | 301 | 682
Dividends on common and preferred stock | 382 | 315
Proceeds from (Payments for) Other Financing Activities | (32) | (32)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | 344 | 593
Cash and Cash Equivalents, Period Increase (Decrease) | (131) | 12
Consolidation, Eliminations [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | 0 | 13
Purchase of investments subject to significant influence, inclusive of acquisition costs | 0 | 0
Other investing activities | 572 | 1,098
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | 0 | 0
Proceeds from Issuance of Long-term Debt | (194) | 13
Retirement of long-term debt | 0 | (15)
Proceeds from Long-term Lines of Credit | 110 | 9
Issuance of common and preferred stock, net of issuance costs | (446) | 1,898
Dividends on common and preferred stock | (348) | (314)
Proceeds from (Payments for) Other Financing Activities | (123) | (376)
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations | 0 | 0
Cash and Cash Equivalents, Period Increase (Decrease) | 0 | 0
Beginning Balance | 0 | 0
Ending Balance | 0 | 0
Parent Company [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | (9) | 5
Purchase of investments subject to significant influence, inclusive of acquisition costs | 0 | 0
Other investing activities | (489) | 742
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | 0 | 0
Proceeds from Issuance of Long-term Debt | 0 | 0
Retirement of long-term debt | 0 | 0
Proceeds from Long-term Lines of Credit | 136 | (30)
Issuance of common and preferred stock, net of issuance costs | 301 | 682
Dividends on common and preferred stock | 382 | 315
Proceeds from (Payments for) Other Financing Activities | 0 | 290
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations | (4) | 1
Cash and Cash Equivalents, Period Increase (Decrease) | (256) | 76
Beginning Balance | 276 | 200
Ending Balance | 20 | 276
Subsidiary Issuer [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | 0 | 0
Purchase of investments subject to significant influence, inclusive of acquisition costs | 0 | 0
Other investing activities | 0 | 26
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | 0 | 0
Proceeds from Issuance of Long-term Debt | 0 | 0
Retirement of long-term debt | 0 | 0
Proceeds from Long-term Lines of Credit | 0 | 0
Issuance of common and preferred stock, net of issuance costs | 0 | 0
Dividends on common and preferred stock | 0 | 0
Proceeds from (Payments for) Other Financing Activities | 0 | 0
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations | 2 | (3)
Cash and Cash Equivalents, Period Increase (Decrease) | 37 | (7)
Beginning Balance | 21 | 28
Ending Balance | 58 | 21
Guarantor Subsidiaries [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | (1,687) | 1,031
Purchase of investments subject to significant influence, inclusive of acquisition costs | (16) | 0
Other investing activities | 3 | 5
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | (162) | 365
Proceeds from Issuance of Long-term Debt | 1,174 | 147
Retirement of long-term debt | (716) | 413
Proceeds from Long-term Lines of Credit | (103) | 59
Issuance of common and preferred stock, net of issuance costs | 319 | 134
Dividends on common and preferred stock | 37 | 29
Proceeds from (Payments for) Other Financing Activities | 0 | 96
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations | 9 | 1
Cash and Cash Equivalents, Period Increase (Decrease) | 50 | (18)
Beginning Balance | 54 | 72
Ending Balance | 104 | 54
Non-Guarantor Subsidiaries [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Additions to property, plant and equipment | (466) | 480
Purchase of investments subject to significant influence, inclusive of acquisition costs | (33) | 213
Other investing activities | (65) | (1,852)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Change in short-term debt, net | 0 | (13)
Proceeds from Issuance of Long-term Debt | 75 | (31)
Retirement of long-term debt | (41) | 55
Proceeds from Long-term Lines of Credit | 178 | 192
Issuance of common and preferred stock, net of issuance costs | 127 | (2,032)
Dividends on common and preferred stock | 311 | 285
Proceeds from (Payments for) Other Financing Activities | 91 | (42)
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations | 18 | (12)
Cash and Cash Equivalents, Period Increase (Decrease) | 38 | (39)
Beginning Balance | 152 | 191
Ending Balance | $ 190 | $ 152

X
- References No definition available. + Details
Name: | ema_Ema_paymentsofdividendscommonandpreferredstock
Namespace Prefix: | ema_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ema_Ema_proceedsfromissuanceofcommonstockandpreferredstock
Namespace Prefix: | ema_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
Name: | us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
Name: | us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 + Details
Name: | us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromLongTermLinesOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
Name: | us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
Name: | us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from a borrowing having initial term of repayment of more than three months but less than one year or one operating cycle (if the normal cycle is more than one year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_SubsidiaryIssuerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_NonGuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |